O Time with your teethy years! You swallow up all things little by little in a slow-motion, wrinkling process of dying.
Leonardo da VinciOh! Speculators on things, boast not of knowing the things that nature ordinarily brings about; but rejoice if you know the end of those things which you yourself device.
Leonardo da VinciYou must grow in patience when you meet with great wrongs, and they will then be powerless to vex your mind.
Leonardo da VinciNow do you not see that the eye embraces the beauty of the whole world? It counsels and corrects all the arts of mankind... it is the prince of mathematics, and the sciences founded on it are absolutely certain. It has measured the distances and sizes of the stars it has discovered the elements and their location... it has given birth to architecture and to perspective and to the divine art of painting.
Leonardo da Vinci